Question... Are some dependencies missing from Umbraco 9.5?

[hfloyd]

I set up a fresh 9.5 site using the VS "Umbraco Project" template, and came across an odd runtime issue when using IIS for the localhost (because I like to use real hostnames and not always run sites in debug-mode via VS).

@NikRimington summed up the issue most succinctly when I did a search on the Umbraco Discord about it, so I will quote him:

Does anyone know why Umbraco v9 in IIS results in a "InvalidOperationException: Cannot find compilation library location for package 'System.Drawing.Common'" but running it via Kestral doesn't?

My experience was the same - if I ran it via IIS Express (debug inside VS) - no runtime error. If I used IIS, pointing to the UmbracoProject folder - Runtime error.

I didn't see any specific responses to Nik's query, and I went on my own wild-goose-chase to figure out if there was some magical setting which would make it "just work".... (After all, I was running an Umbraco 9 Cloud site locally without this issue...) Alas, too many hours later, I just ended up adding a reference via NuGet for "System.Drawing.Common" Version="5.0.3", which resolved that issue, but brought up a new, similar error about missing "System.Security.Cryptography.Pkcs", so I added that as well ("System.Security.Cryptography.Pkcs" Version="5.0.1"), and now the site loads via IIS.

So, my question is : Are these required references which are just missing from the Umbraco.Cms NuGet package? If not, does anyone have an understanding of what is going on here?

A few random (maybe related?) references:
System.Drawing.Common.dll is not added to Net Core build output

PackageReference assembly is not included in the bin dir of a .NET standard project

InvalidOperationException: Cannot find compilation library location for package 'System.Security.Cryptography.Pkcs'

Razor templates: Cannot find compilation library location for package

[nul800sebastiaan]

Which .NET version are you on? And @NikRimington ?

We should get better at promoting this button for these kinds of questions 😅

Which results in something like:

Category	Data
Server OS	Microsoft Windows 10.0.14393
Server Framework	.NET 5.0.15
Default Language	en-US
Umbraco Version	9.3.2-apreview001
Current Culture	en-US
Current UI Culture	en-US
Current Webserver	IIS
Browser	Edge-chromium 101.0.1210.39
Browser OS	Win32

We don't rely on System.Drawing.Common ourselves, though Imagesharp seems to need it but only for tests.

I can see I don't have the dll for a dotnet 5 Umbraco site (anecdotally, I only tried one) and it is copied into the bin for dotnet 6 Umbraco sites (only looked at 2 of them).

Do you have both the sdk and the hosting bundle installed on the machine?

Hosting bundle: https://dotnet.microsoft.com/en-us/download/dotnet/6.0/runtime
SDK: https://dotnet.microsoft.com/en-us/download

[NikRimington]

To be honest, I've abandoned IIS for the time being and I'm purely using IIS Express / Kestral when running the sites locally. So any comments I add are from memory, but I do remember installing the hosting bundle and the SDK.

I recently did the Load Balancing Course and had a v9 site running in IIS with no problems and I didn't have to install either (so making the assumption that both are already installed).

For a time frame, my discord post is dated 2022-03-02 so it's a couple of months old.

In simple, I never solved the problem as I wasn't prepared to install "unnecessary" packages. But I have found that sometimes I have to do a dotnet build before a dotnet run or dotnet publish for Nuget to restore things correctly.

[hfloyd]

My site info:

Category	Data
Server OS	Microsoft Windows 10.0.19044
Server Framework	.NET 5.0.16
Default Language	en-US
Umbraco Version	9.5.0
Current Culture	en-US
Current UI Culture	en-US
Current Webserver	IIS
Models Builder Mode	Nothing
Debug Mode	True
Database Provider	System.Data.SqlClient
Browser	Chrome 101.0.4951.54
Browser OS	Win32

(Wow - I didn't know that was there! Learning new things every day! Thanks, @nul800sebastiaan 😊)

[hfloyd]

RE:

In simple, I never solved the problem as I wasn't prepared to install "unnecessary" packages. But I have found that sometimes I have to do a dotnet build before a dotnet run or dotnet publish for Nuget to restore things correctly.

Yeah, installing those extra packages didn't feel right, but after spending 4 hours trying to figure it out, it's time to throw in the towel so I can move on with the project. 🤷‍♀️

I have been running "Rebuild Solution" in VS, then popping over to the browser with my custom hostname and refreshing.... So, I'd imagine that is equivalent to dotnet build ?